If it’s September, it’s time for another crazed rant from Mahmoud Ahmadinejad.

The pariah president of Iran prompted another walkout by UN delegates from more than 30 countries after he used his annual appearance before the General Assembly to again spew hate-filled conspiracy theories.

Once again he questioned the Holocaust and charged that the United States used the 9/11 terror attacks as an excuse for war.

“Who used the mysterious September 11th incident as a pretext to attack Afghanistan and Iraq, killing, injuring and displacing millions in two countries with the ultimate goal of breaking into an Islamic nation, the Middle East and its oil resources?” he asked during his 32-minute tirade.

This time, Ahmadinejad arrived with new material, questioning why Osama bin Laden had been killed.

“Would it not have been reasonable to bring him to justice and try him openly?” he asked.

Just hours after Ahmadinejad’s performance, the former engineer told an interviewer that the World Trade Center was felled not by planes but planned explosions.

“I can say with certainty that there was explosive material that was set off in sequence,” he said.

A spokesman for the US mission to the UN, Mark Kornblau, said “Mr. Ahmadinejad had a chance to address his own people’s aspirations for freedom and dignity — but instead he again turned to abhorrent anti-Semitic slurs and despicable conspiracy theories.”

Outside, 400 demonstrators, many chanting “Ahmadinejad is a terrorist,” protested his annual embarrassment.